error in my Navigation. PushAsync (new DetailsPage (monkey)) - xamarin

Question

I'm following the following example of carousel with the listview, more when I go to open Navigation.PushAsync the item in the listview is called only the first item, on all items clicked his name only the first item, a position error?
void Handle_ItemSelected(object sender, SelectedItemChangedEventArgs e)
{
var monkey = ((ListView)sender).SelectedItem as Monkey;
if (monkey == null)
return;
Navigation.PushAsync(new DetailsPage(monkey));
}
https://blog.xamarin.com/flip-through-items-with-xamarin-forms-carouselview/
EDIT
MonkeysPage.xaml
<?xml version="1.0" encoding="UTF-8"?>
<ContentPage
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="Monkeys.Views.MonkeysPage"
xmlns:design="clr-namespace:Monkeys;assembly=Monkeys"
xmlns:controls="clr-namespace:ImageCircle.Forms.Plugin.Abstractions;assembly=ImageCircle.Forms.Plugin.Abstractions"
xmlns:cv="clr-namespace:Xamarin.Forms;assembly=Xamarin.Forms.CarouselView"
BindingContext="{x:Static design:ViewModelLocator.MonkeysViewModel}"
x:Name="MonkeysPage"
Title="Traditional Monkeys">
<ContentPage.Content>
<ListView ItemsSource="{Binding MonkeysGrouped}"
ItemSelected="Handle_ItemSelected"
HasUnevenRows="true"
GroupShortNameBinding = "{Binding Key}"
IsGroupingEnabled = "true"
GroupDisplayBinding = "{Binding Key}">
<ListView.Header>
<cv:CarouselView x:Name="CarouselZoos" ItemsSource="{Binding Path=BindingContext.Zoos, Source={x:Reference MonkeysPage}}" HeightRequest="200">
<cv:CarouselView.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Image Grid.RowSpan="2" Aspect="AspectFill" Source="{Binding ImageUrl}"/>
<StackLayout Grid.Row="1" BackgroundColor="#80000000" Padding="12">
<Label TextColor="White" Text="{Binding Name}" FontSize="16" HorizontalOptions="Center" VerticalOptions="CenterAndExpand"/>
</StackLayout>
</Grid>
</DataTemplate>
</cv:CarouselView.ItemTemplate>
</cv:CarouselView>
</ListView.Header>
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Grid Padding="10" RowSpacing="10" ColumnSpacing="10">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<controls:CircleImage
BorderColor="Aqua"
BorderThickness="3"
HeightRequest="66"
HorizontalOptions="CenterAndExpand"
VerticalOptions="CenterAndExpand"
Aspect="AspectFill"
WidthRequest="66"
Grid.RowSpan="2"
Source="{Binding Image}"/>
<Label Grid.Column="1"
Text="{Binding Name}"
VerticalOptions="End"/>
<Label Grid.Column="1"
Grid.Row="1"
VerticalOptions="Start"
Text="{Binding Location}"/>
</Grid>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
MonkeysPage.xaml.cs
public MonkeysPage()
{
InitializeComponent();
BindingContext = new MonkeysViewModel();
}
async void Handle_ItemSelected(object sender, SelectedItemChangedEventArgs e)
{
var monkey = e.SelectedItem as Monkey;
if (monkey == null)
return;
await Navigation.PushAsync(new DetailsPage(monkey)); // always await Navigations
((ListView)sender).SelectedItem = null;
}
DetailsPage.xaml
<?xml version="1.0" encoding="UTF-8"?>
<ContentPage
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="Monkeys.Views.DetailsPage"
xmlns:design="clr-namespace:Monkeys;assembly=Monkeys"
xmlns:controls="clr-namespace:ImageCircle.Forms.Plugin.Abstractions;assembly=ImageCircle.Forms.Plugin.Abstractions"
BindingContext="{x:Static design:ViewModelLocator.DetailsViewModel}"
Title="{Binding Monkey.Name}">
<ContentPage.Content>
<ScrollView>
<StackLayout Padding="10">
<controls:CircleImage
BorderColor="Aqua"
BorderThickness="3"
HeightRequest="200"
WidthRequest="200"
HorizontalOptions="CenterAndExpand"
Aspect="AspectFill"
Source="{Binding Monkey.Image}"/>
<Label Text="{Binding Monkey.Name}" FontAttributes="Bold"/>
<Label Text="{Binding Monkey.Location}" FontSize="Micro"/>
<Label Text="{Binding Monkey.Details}" FontSize="Large"/>
</StackLayout>
</ScrollView>
</ContentPage.Content>
DetailsPage
public partial class DetailsPage : ContentPage
{
public DetailsPage(Monkey monkey)
{
InitializeComponent();
}
}

Answer 1

You're doing everything good except that you forgot to reset the SelectedItem to null, that's why you are getting always the first list item clicked.
Your code should look like this:
async void Handle_ItemSelected(object sender, SelectedItemChangedEventArgs e)
{
var monkey = e.SelectedItem as Monkey;
if (monkey == null)
return;
await Navigation.PushAsync(new DetailsPage(monkey)); // always await Navigations
((ListView)sender).SelectedItem = null;
}
P.S. Make your method async so you don't cause UI Thread to block
EDIT
Try to get the selected item from SelectedItemChangedEventArgs.
var monkey = e.SelectedItem as Monkey;
UPDATE
Okay the SelectedItem is being updated successfully but the 'Monkey Item' on the ViewModel behind the DetailsPage is not!
So on DetailsPage add this line:
public partial class DetailsPage : ContentPage
{
public DetailsPage(Monkey monkey)
{
InitializeComponent();
BindingContext = new DetailsViewModel(monkey); // Update the BindingContext
}
}
And remove this line on the DetailsPage.xaml:
BindingContext="{x:Static design:ViewModelLocator.DetailsViewModel}"